(E)-tert-Butyl-3-(2-methoxycarbonylethyl)-4-methyl-5-(2-nitrovinyl)-pyrrole-2-carboxylate

(Z)-tert-Butyl-2,3-dihydro-3,3,7-trimethyl-8-(2-methoxycarbonylethyl)-dipyrrin-1-one-9-carboxylate

(rac)-tert-Butyl-3-(2-methoxycarbonylethyl)-4-methyl-5-(2-nitro-3,3-dimethyl-4-methoxycarbonylbutyl)-pyrrole-2-carboxylate

tert-Butyl-3-(2-methoxycarbonylethyl)-4-methyl-5-(2-nitroethyl)-pyrrole-2-carboxylate

(Z)-9-tert-Butoxycarbonyl-2,3-dihydro-3,3,7-trimethyl-dipyrrin-1-one-8-propanoic acid